For the following protocols, which pair of routing protocols does not support VLSM or classless
interdomain routing (CIDR)?

A.
RIPv1 and RIPv2

B.
Intermediate System-to-Intermediate System (IS-IS) and Open Shortest Path First (OSPF)

C.
EIGRP and IGRP

D.
RIPv1 and IGRP

Explanation: